Related for Pesachim 10:10

They mix him the first cup. Beit Shammai says, he blesses on the day and then he blesses on the wine, because the holiday is the direct reason for drinking the wine, and the holiday had already started when the wine was brought to the table. Beit Hillel says, he blesses on the wine and then he blesses on the day, because if we didn't have the wine we wouldn't be saying Kiddush on the holiday at all. Another explanation: the blessing on wine is regularly said and the blessing on the holiday is not. And the halacha is according to Beit Hillel.

We may not eat an afikoman [a dessert or other foods eaten after the meal] after [we are finished eating] the Pesach sacrifice; for example nuts, dates and roasted wheat. A man is obligated to be involved with the laws of Pesach the whole night, even if it [is only a discussion] between him and his son, even if it is between him and himself, even if it is between him and his student. It happened that Rabban Gamliel and the Elders were [once] reclining in the house of Beitos ben Zunin in Lud, and they were involved with the laws of Pesach the whole night until the call of the rooster. [Their students] raised the covering of the window from in front of them, and they [then] convened and went to the house of study. What is the blessing on the Pesach sacrifice? Blessed [...] who has sanctified us with His commandments and has commanded us on the eating of the Pesach sacrifice. What is the blessing on the [other] offerings? Blessed [...] who has sanctified us with His commandments and has commanded us on the eating of the offering.

Rabbi Elazar ben Parta recited the words [of the Hallel] in a simple fashion [whereas] Rebbi would repeat his words (Y. Sukk. III.10.5). Rabbi Eliezer said, we grab the matzah for the children so that they don't fall asleep (Pes. 109a:1). Rabbi Yehudah says, even if he did not eaten [anything] except one appetizer, [and] even if he has not dipped [anything] except one [leaf of] lettuce, we grab the matzah for the children so that they don't fall asleep. How far does one recite [the Hallel, see Mish. 6:10]? Beit Shammai says, until "As a happy mother of children" (Psalms 113:9), and Beit Hillel says, until "[who turned the rock into a pool of water,] the flinty rock into a fountain" (Psalms 114:8), and he concludes with [the theme of] redemption. Said Beit Shammai to Beit Hillel, "But he had already completed the remembrance of the Exodus from Egypt!" (i.e., why would we conclude the Hallel with the crossing of the Red Sea (Psalm 114) if we have already recounted the entire Exodus?). Said Beit Hillel back to them, "even if he would wait until the rooster crows [to say Hallel], behold, [the Israelites] did not leave [Egypt] until six hours into the day, so how can we speak of the redemption when they have not yet been redeemed?" [With respect] to eating matzah, the bitter herb, and the haroset: Even if there is no charoset, the mitzvah [has been fulfilled]. Rabbi Eliezar ben Rabbi Tzadok says, "[It is indeed] a mitzvah [to eat charoset]. In the Temple, they would bring before him the body of the Paschal lamb." (Pes. 10:3.) [Presumably, he viewed the charoset as a substitute for the Paschal lamb, see Exodus 12:8.]

And they may not conclude the Pesach meal with an afikoman [a dessert or other foods eaten after the meal], like nuts and dates and parched corn. A person must engage in the laws of Pesach all night, even if it is just him with his son, even if it is just him by himself, and even if it is just him and his student.